engineers back at jpl send the signal. the signal goes back to that. it does maybe 10 or 15 feet, comes back, says i made it. got all the way here. let's do it again. they send another signal the next day or next day. >> can't wait until they head toward mt. sharp. chad myers, thank you. we'll keep talking about it. that's it for me. brooke baldwin here in new york. hope you wake up with me. in the meantime, here's wolf. in the meantime, here's wolf. your situation room begins now. -- captions by vitac -- www.vitac.com >>> happening now, the embattled senate candidate todd akin digging in. can republicans across the country whether this storm? >>> plus, all eyes on an actual storm. isaac may be headed toward the gop convention site in tampa. just as festivities get under way. we'll have the latest update from the national hurricane center. it's about to be released. we'll also bring it to you just as soon as it comes in. >>> an explosive outbreak of west nile virus consuming much of the united states right now. the death toll already topping 40 people